Sperm DNA fragmentation in men vaccinated with Gam-COVID-Vac (Sputnik V)

Aim. To perform comparative analysis of sperm characteristics and DNA fragmentation in men vaccinated with GamCOVID-Vac (Sputnik V) and unvaccinated men.

Materials and methods. Characteristics ofsemen analysis and DNA fragmentation index in ejaculate samples of 122 men, 28 of whom were vaccinated with Gam-COVID-Vac (Sputnik V), were analyzed. Study participants did not have history of coronavirus infection COVID-19. Vaccinated patients were divided into 2 groups: group 1 (n = 10) included patients for whom the time between full vaccination (2 doses of the vaccine) and ejaculate sampling was shorter than 75 days; and the group 2 (n = 18) included patients for whom the time between vaccination and ejaculate sampling was longer than 75 days. Unvaccinated men comprised the control group (group 3, n = 94). Standard semen analysis was performed in accordance with the accepted laboratory guidelines of the World Health Organization (2010). DNA fragmentation was evaluated using fluorescent labelling of single- and double-strand DNA breaks (TUNEL).

Results. Totalsperm countin the group 1 was 265 ± 75 million, in the group 2 – 355 ± 67 million, in the group 3 – 304 ± 26 million. Progressive motile (PR)sperm in the group 1was 18.5 ± 1.9 %, in the group 2 – 23.2 ± 3.0 %, in the group 3 – 18.2 ± 1.1 %. Normal sperm morphology in the group 1 was 4.0 ± 0.5 %, in the group 2 – 5.8 ± 0.9 %, in the group 3 – 4.1 ± 0.3 %. The best ejaculate quality was observed in patients of the group 2, however, no statistically significant differences in semen analysis characteristics between the groups were found. Percentage of sperm with fragmented DNA (DNA fragmentation index, DFI) in the group 1 varied between 4.6 and 31.4 %, in the group 2 between 0.8 and 36.5 %, in the group 3 (control) between 1.3 and 39.8 %. Mean number of germ cells with DNA breaksin the group 1 (12.5 ± 2.4 %) was higher than in the group 2 (10.9 ± 2.0 %) and control group (10.5 ± 0.7 %), but with no statistical significance. Percentage of patients with DNA fragmentation index above the reference value (≤15 %) in the groups 1, 2 and 3 was 20, 22 and 18 % respectively. In 3 of 6 patients with increased DFI in the groups 1 and 2, this value was above the reference level even before vaccination.

Conclusion. No significant effect of vaccination with Sputnik V on sperm DNA fragmentation level in men was observed.

Semen parameters in male carriers of Robertsonian translocations (13;14)

Background. Robertsonian translocations (RTs) are the most common type of balanced chromosomal abnormalities. RT male carriers have an increased risk of reproductive disorders, but the causes of this still are not clear enough.

Aim. To evaluate semen parameters in RT(13;14) male carriers.

Materials and methods. 24 men with 45,XY,der(13;14)(q10;q10) karyotype and infertility (n = 23) or recurrent pregnancy loss in spouse (n = 1).

Results. Oligoasthenoteratozoospermia was detected in 18 (75 %) patients, asthenoteratozoospermia in 3 (13 %) patients, and azoospermia in 2 (8 %) patients. Normozoospermia was detected in 1 (4 %) patient, whose wife had a history of recurrent pregnancy loss.

Conclusion. Infertility in the examined RT male carriers is associated with spermatogenesis disorders, in most cases resulted in oligozooasthenoteratozoospermia.

[Interaction of herpesviruses with mature human spermatozoa in the model system in vitro]

The DNA of human herpesviruses (HHV), including the herpes simplex virus (HSV) and cytomegalovirus (CMV), is often identified in ejaculates of patients with urogenital diseases and infertility. At least a part of viral DNA is associated with cell fraction of ejaculate. However, it remains unclear how the semen is infected by the virus. It can be located in gametes or be capable of infecting mature germ cells, including motile sperm cells. In order to resolve this issue, interactions of the CMV and HSV with human sperm cells were studied using an original optimized model of the herpesviral infection of male gametes in vitro. The analysis of the immunofluorescent staining of gametes for viral antigens has shown that CMV infected 2% gametes, while HSV infected 17.26 ± 2.58% gametes. The fraction of progressively motile sperm cells contained 13.99 ± 4.64% infected cells. Localization of HSV was studied by the confocal microscopy. Sometimes, viral gB protein was found on sperm cell membrane. In addition, optical scanning of other cells has shown the intracellular localization of the viral proteins. In the majority of spermatozoa, the viral proteins were observed in the head and neck. In some cells, they were located in the middle piece or, rarely, in the equatorial segment. In general, after in vitro infection HSV antigens were located in the same areas of the sperm cells as in ejaculates from infected patients. According to DNA-DNA hybridization in situ, gametes containing HSV DNA accounted for 16.94 ± 5.28%, which is consistent with the results obtained in the immunofluorescence assay. It can be concluded that mature male gametes are infected by HHV in the genital tract, where the virus binds to the sperm cell membrane and enters the cell. Interaction of HHV with progressively motile sperm cells implies a vertical viral transmission upon fertilization and points to the necessity of testing ejaculate for herpesviruses infections.

Detection of a mutation in the intron of Sperm-specific glyceraldehyde-3-phosphate dehydrogenase gene in patients with fibrous sheath dysplasia of the sperm flagellum

The fibrous sheath is a unique cytoskeletal structure surrounding the axoneme and outer dense fibres of the sperm flagellum. Dysplasia of the fibrous sheath (DFS) is a defect of spermatozoa observed in severe asthenozoospermic patients and characterised by morphologically abnormal flagella with distorted fibrous sheaths. Sperm-specific glyceraldehyde-3-phosphate dehydrogenase (GAPDS) is a glycolytic enzyme that is tightly associated with the fibrous sheath of the sperm flagellum. The enzymatic activity of GAPDS was investigated in sperm samples of seven patients with DFS and compared to that of normal spermatozoa (n = 10). The difference in GAPDS activity in DFS and normal spermatozoa was statistically significant (0.19 ± 0.11 and 0.75 ± 0.11 μmol NADH per min per mg protein respectively). Immunochemical staining revealed irregular distribution of GAPDS in the flagellum of DFS spermatozoa. Other five samples with typical alterations in the fibrous sheath were assayed for mutations within human GAPDS gene. In all five cases, a replacement of guanine by adenine was revealed in the intron region between the sixth and the seventh exons of GAPDS. It is assumed that the deficiency in GAPDS observed in most DFS sperm samples is ascribable to a disorder in the regulation of GAPDS expression caused by the mutation in the intron region of GAPDS gene.

[QUANTITATIVE DNA EVALUATION OF THE HIGH CARCINOGENIC RISK OF HUMAN PAPILLOMA VIRUSES AND HUMAN HERPES VIRUSES IN MALES WITH FERTILITY DISORDERS]

Infertility is an actual medical and social problem. In 50% of couples it is associated with the male factor and in more than 50% of cases the etiology of the infertility remains insufficiently understood. The goal of this work was to study the prevalence and to perform quantitative analysis of the human herpes viruses (HHV) and high carcinogenic risk papilloma viruses (HR HPV) in males with infertility, as well as to assess the impact of these infections on sperm parameters. Ejaculate samples obtained from 196 males fall into 3 groups. Group 1 included men with the infertility of unknown etiology (n = 112); group 2, patients who had female partners with the history of spontaneous abortion (n = 63); group 3 (control), healthy men (n = 21). HHV and HR HPV DNA in the ejaculates were detected in a total of 42/196 (21.4%) males: in 31 and 11 patients in groups 1 and 2, respectively (p > 0.05) and in none of healthy males. HHV were detected in 24/42; HR HPV, in 18/42 males (p > 0.05) without significant difference between the groups. Among HR HPV genotypes of the clade A9 in ejaculate were more frequent (14/18, p = 0.04). Comparative analysis of the sperm parameters showed that in the ejaculates of the infected patients sperm motility as well as the number of morphologically normal cells were significantly reduced compared with the healthy men. The quantification of the viral DNA revealed that in 31% of the male ejaculates the viral load was high: > 3 Ig10/100000 cells. Conclusion. The detection of HHV and HR HPV in the ejaculate is associated with male infertility. Quantification of the viral DNA in the ejaculate is a useful indicator for monitoring viral infections in infertility and for decision to start therapy.

[Mechanisms of smooth endoplasmic reticulum aggregates creation in oocyte's cytoplasm in IVF cycles and its clinical relevance (literature review)]

A large proportion of human oocytes received from exogenous gonadotropin-stimulated cycles have different morphological attributes, or dysmorphisms. The presence of dysmorphism can affect the fertilization rate, the embryo quality and subsequently the frequency of occurrence of implantation and pregnancy. Special attention is paid to oocytes with cytoplasmic attributes such as alteration of cytoplasmic granularity, the appearance of vacuoles, lipofuscin bodies and visible (large) aggregates of smooth endoplasmic reticulum. Endoplasmic reticulum (ER) is a type of the organelle forming an interconnected network of flattened, membrane-enclosed sacs or tubes. One of the main functions of ER in the oocyte is storage and redistribution of calcium, which provides cell activation during fertilization. Furthermore, complex of ER and mitochondria is necessary for accumulation of energy, synthesis of lipids and triglycerides, as well as synthesis of cytosolic and nuclear membranes during the early stages of cleavage. The appearance of anomalously large aggregates of ER in oocytes correlates with a low fertilization rate, low embryo quality, and pregnancy rate. The aim of the manuscript is to summarize current understanding of the mechanism of formation of such pathology of oocytes, together with special aspects of their fertilization and embryo quality.

[Effect of herpes simplex virus on spermatogenesis]

To investigate the effect of Herpes Simplex virus (HSV) on spermatogenesis, HSV in ejaculate was detected by a rapid cultural method in 268 infertile males and 47 healthy ones. The number of mobile spermatozoa in HSV infected samples was less than in non-infected samples (21 mln/mlversus 40 mln/ml, p = 0.0001). The relative number of morphologically normal gametes was 13% versus 19% (p = 0.002), respectively. The quantitative karyological test discovered that males with HSV-infected ejaculate have more degenerating sex cells while in high virus contamination (more than 10 virus particles in 1 ml) the number of spermatides and spermatocytes of the 1 order at diploten stage is low. Organic testicular culture was used for more detailed study of pathogenetic mechanisms of HSV impact on spermatogenesis. Testicular explants infection was associated with reduction in the number of spermatogones, spermatocytes and spermatides on culturing week 2. The above findings reveal some pathogenetic mechanisms underling fertility disorders in males with HSV infection: a gametotoxic effect of the virus reducing populations of spermatogones, spermatocytes and spermatide; affected mobility and morphological characteristics of spermatozoa. Detection of the mechanisms of HSV action on spermatogenesis opens a perspective of antivirus drug administration in combined treatment of male infertility.

[Testing system for factors damaging female and male gametes and gonads]

The paper discusses the current possibilities of testing the gameto- and gonadotoxic effects of various damaging factors, including those based on the results of a series of in vivo and in vitro experiments and clinical observations by the author et al. It gives the authors' data on the chronological evaluation of and trends in human oogenesis and spermatogenesis.

[Aneuploidy frequency in sperm of fertile men]

Analysis of sperm aneupoidy in 11 healthy men using two- or three-color FISH permitted to determine the average frequency of disomy in chromosomes 13 and 21 (0.11% and 0.2%, respectively), disomy in chromosome 18 (0.05%) and reveal gonosomal aneuploidy variants and their frequency. The frequency of XX disomy was 0.04%; XY, 0.17%; YY, 0.06%; and gonosomal nullisomy, 0.29%. We also assessed the frequency of meiotic nondisjunction of chromosomes 13, 21, 18, X, and Y and the frequency of XX, XY, and YY diploid chromosomes in sperm. The XY variant prevailed in gonosomal aneuploidy and diploidy and was associated with abnormal chromosomal segregation in meiotic anaphase I. The contribution of human sperm chromosomal imbalance to early embryonic lethality and to some chromosomal diseases of syndrome type in the offspring is discussed.

[The frequency and spectrum of mutations and the IVS8-T polymorphism of the CFTR gene in Russian infertile men]

The frequency and spectrum of mutations and the IVS8- T polymorphism of the CFTR gene have been studied in a sample of 963 in Russian infertile men. Mutations have been found in 48 out of 1926 analyzed chromosomes (2.5%) in the heterozygous state (n = 46) and in the compound heterozygote L138ins/N1303K (n = 1/n = 1). A CFTR gene mutation was combined with the 5T allele (mutCFTR/5T) in 11 patients. The following mutations have been found: F508del (n = 18), CFTRdele2,3 (21kb) (n = 9), W1282X (n = 7), 2143delT (n = 4), 3849+10kbC>T (n = 2), L138ins (n = 2), 1677delTA (n = 1), 2184insA (n = 1), 3821delT (n = 1), G542X (n = 1), N1303K (n = 1), and R334W (n = 1). The F508del mutation is the most frequent; it has been detected in 37.5% of the affected chromosomes. The total proportion of four mutations (F508del, CFTRdele2,3 (21kb), W1282X, and 2143delT) is about 79% of all mutations found. The 5T allele has been found in 10.9% infertile men and 4.8% of control men. Significant differences in the frequency of the IVS8-5T variant of the CFTR gene have been found between these groups (p = 0.005), as well as between infertile patients without mutations and control men (p = 0.019). In total, the mutations and/or 5T allele have been found in 14.6% of the patients examined. These data indicate increased frequencies of the mutations of the CFTR gene and its allele variant IVS8-5T in Russian infertile men.

[Herpes simplex virus and cytomegalovirus in male ejaculate: herpes simplex virus is more frequently encountered in idiopathic infertility and correlates with the reduction in sperm parameters]

The present investigation was undertaken to study the detection rate of herpes simplex virus (HSV) and cytomegalovirus (CMV) in the ejaculates of males with infertility and to evaluate the impact of virus infection on the major parameters of sperm. Ejaculates from 808 patients were studied. As compared with apparently healthy individuals, the coupled males with primary infertility were found to have HSV more frequently in both the whole ejaculate (31% versus 17%; p = 0.049) and the fraction of actively motile spermatozoa (30% versus 8%; p = 0.016). Ejaculate HSV detection directly correlated with the reduced amount of actively motile spermatozoa (p = 0.0001) and the smaller proportion of morphologically normal forms of germ cells (p = 0.002). CMV was found to have no impact on the motility and morphology of spermatozoids in the ejaculate. Both HSV and CMV in the male ejaculate were significantly more frequently detectable in winter months. The findings lead to the conclusion that HSV is one of the factors for male infertility and can negatively affect the results of assisted reproductive technologies.

Unique mosaic X/Y translocation/insertion in infant 45,X male

We report on a 45,X male with hydrocephaly, lobar holoprosencephaly and ichthyosis. In situ hybridization and molecular analysis have demonstrated the presence of a mosaic SRY-bearing derivative X chromosome that included Yp and heterochromatic Yq fragments.

[Analysis of germ cell populations in ejaculate of men infected with herpes simplex virus]

Cytological and molecular genetics methods were used to study sperm from patients with sperm infected with herpes simplex virus (HSV) as indicated by virological and immunocytochemical tests. The following methods were used: (1) sperm analysis to evaluate the morphology and functional properties of sperm; (2) fluorescence in situ hybridization (FISH) with DNA probes specific for chromosomes 1, X, and Y to evaluate nondisjunction frequencies of these chromosomes in sperm; and (3) quantitative analysis of immature germ cells in the ejaculate to identify spermatogenic abnormalities. The total sperm count and the count of sperm with normal motility proved similar to the norm. FISH analysis demonstrated no difference in the nondisjunction frequency of chromosomes 1, X, and Y between infertile patients with HSV-infected sperm and fertile donors. Comparative quantitative analysis of immature germ cells from the ejaculate has demonstrated a significant and considerable (threefold) increase in the number of spermatocytes I at the prepachytene stages of prophase I (preleptotene, leptotene, and zygotene) in HSV patients compared to normal donors. At the same time, HSV patients demonstrated a significant decrease in the number of spermatocytes I, a decrease in the proportion of spermatocytes II and spermatids, and a twofold increase in the number of unidentifiable immature germ cells. The data obtained indicate a partial spermatogenic arrest at the early stages of meiotic prophase I in HSV patients, which prompts further research into the cellular mechanisms of abnormal spermatogenesis after viral infection in humans.

[Herpetic infection of spermatozoa in failure of reproductive technologies and spontaneous abortion]

Herpes simplex virus (HSV) was studied in ejaculate of 36 men whose wives had the history of spontaneous abortions, or failure of artificial insemination (AI), or extracorporeal fertilization (ECF). The control group consisted of 222 patients examined prophylactically after urogenital inflammation or for primary infertility. HSV was detected with immunofluorescence (IF) reaction with monoclonal antibodies to HSV antigens, rapid culture method (RCM) and transmission electronic microscopy. HSV antigens were detected in fraction of mobile spermatozoa in 13 (65%) of 20 samples from patients of the study group. HSV detectability in the study group was significantly higher than in the controls (p = 0.003). Intragametic capsides of HSV were detected at ultrastructural investigation in 13 of 19 (68%) ejaculate samples from patients of the study group in whom IF and/ or RCM results were positive. The study of 6 ejaculate samples of this group in which HSV was not detected by IF or RCM and 24 control samples HSV capsides were not detected. The following conclusions can be made: mobile spermatozoa of normal morphology can be infected with HSV; as shown morphologically, samples of ejaculate from men whose wives had spontaneous abortions contained intragametic HSV capsides; intragametic HSV infection of spermatozoa had a negative effect on the course of pregnancy and/or embryon vitality.

[Asymptomatic genital herpes infection and infertility in males]

Incidence of Herpes simplex virus (HSV) was studied in ejaculates of 100 men. The examinees had neither history nor clinical symptoms of HSV genital infection. HSV was detected by a rapid cultural method in the ejaculate of 20 out of 100 examinees (20%). Of 67 males with infertility HSV was detected in 25%, in 19 males examined prophylactically and 14 patients with varicocele (a comparison group) it was found in 10.5 and 7% cases, respectively. Oligozoospermia was two times more frequent in HSV-containing ejaculates than in HSV-negative one. Mean values of the majority of sperm parameters in HSV-positive and HSV-negative groups did not differ statistically. However, it was revealed that such damage of the spermatozoa structure as microhead (consequence of the defective acrosome or reduced genome) and cytoplasm drops on the neck (a sign of immature forms) occurred more often in HSV-infected patients than in persons with HSV-negative ejaculate. Thus, asymptomatic HSV infection has a negative effect on male fertility.

[Effects of sulfate mineral water for drinking in combination with laser and magnetolaser radiation on occurrence of pathological mitoses in spermatogones of irradiated rats and their progeny]

Drinking sulfate mineral water in combination with low-intensive infra-red laser or magneto-laser radiation is shown to effectively depress development of different forms of pathological mitoses in spermatogones of irradiated rats and in their first-generation progeny.

[Types of Y chromosome deletions and their frequency in infertile men]

Deletions of Y chromosome AZF locus were analyzed during a large-scale andrological and genetic examination of 810 infertile men. The search for Yq microdeletions was carried out according to the standard EAA/EMQN guidelines. The breakpoints were mapped for the deletions in AZF locus. The Y chromosome macro- and microdeletions were detected in 61 (7.5%) infertile men. The frequencies of AZF deletions during azoospermia and severe oligozoospermia amounted to 12.2 and 8.1 %, respectively. On the whole, the frequencies of Yq microdeletions and the genophenotypic correlations characteristic of various AZF deletion types comply with the relevant published data. However, spermatozoids in the ejaculate sediment of men with completely deleted AZFa region or AZFb+c deletions (from solitary spermatozoids to several dozens) were detected for the first time. It was demonstrated that the breakpoints were localized between AZFa and AZFb regions proximally to AZFb+c microdeletions for the majority of cytogenetically detectable deletions in the Y chromosome long arm. This indicates that the mechanisms underlying Yq macro- and microdeletions are somewhat different. The issues related to the role of Y chromosome deletions in the origins of monosomy for X chromosome and X/XY mosaicism are discussed.

[The effect of mutation dominant spotting-Yurlovo (KitW-Y) on spermatogenesis, early embryogenesis, and fertility of C57BL/6JY mice]

The effect of mutation KitW-Y found in C57BL/6 mice on fertility, spermatogenesis, and early embryogenesis of mice have been studied. If heterozygotes KitW-Y/+ are crossed with wild-type mice, fertility decreases by 20%. Homozygotes Kitw-Y/KitW-Y and compounds KitW-Y/KitSsm are nonviable. The study of spermatogenesis in KitW-Y/+ mice has demonstrated a negative effect of this mutation on spermatocytes. Histological examination of the testes of mutant males has shown local empty spaces in seminal ducts. Electron microscopic examination of synaptonemal complexes have demonstrated desynapsis disturbance in some nuclei at the diplotene stage of meiotic prophase I. However, these disturbances do not cause a decrease in the number of fertilized oocytes/ova. The decrease in fertility is accounted for disturbances of early embryogenesis. In vivo and in vitro analyses of early embryogenesis have demonstrated that cleavage divisions are asynchronous in KitW-Y/+ heterozygous embryos. Some of these embryos die before implantation, and others cleave more rapidly than wildtype embryos, which give them selective advantage during the postimplantation period of embryogenesis. The pattern of KitW-Y expression during spermatogenesis and embryogenesis mimics potential human pathology, which makes these mutants an interesting and valuable object for genetics and developmental biology.

[Effects of sulfate mineral water and vetoron on the rate of radiation-induced aneuplodia in the bone marrow cells of rats]

Experiments on non-inbred male rats have found that pretreatment with drinking sulfate mineral water and veteron reduced incidence of radiation-induced aneuplodia in bone marrow cells. The proportion of cells with normal number of chromosomes went up.

[Radioprotective effect of drinking sulfate mineral water on spermatogenesis in offspring of irradiated male rats]

Histological and electron-microscopic studies of a radioprotective action of drinking sulphate mineral water (SMW) on spermatogenesis of irradiated male rats' progeny have found that SMW used before radiation (2 Gy) and 10 days after it is able to reduce postradiation sequelae in the progeny (2-5 month and 1.5 year old rats) testes.

Changes in antigenic characteristics of erythrocytes and number metaphase chromosome in bone marrow cells after experimental and clinical bone marrow transplantation

Transplantation of allogenic bone marrow from HLA-identical sibs to patients with acute and chronic leukemia receiving immunosuppressive therapy is associated with the appearance of erythrocytes simultaneously carrying donor and recipient antigenic markers: AB0 system, rhesus factor and its subtypes, M and N antigens. Integration of genes responsible for each antigen is realized independently presumably at the level of stem cell, which ensures long-term (>3 years) repopulation of these erythrocytes. Experiments on inbred mice showed that transplantation of allogenic bone marrow is associated with an increase of chromosome number in 39% bone marrow cells 4 days after transplantation, which indicate the possibility of integration of whole chromosomes.

[Genetic control of hormonal regulation of sex differentiation and development of the human reproductive system]

Literature data on genetic control of hormonal regulation of sexual differentiation and reproduction system development in humans are reviewed. The conditions caused by mutations of genes for gonadoliberin, gonadotorpin, and anti-Mullerian hormone, as well as genes controlling biosynthesis of sexual steroids and the receptors for the latter, are considered.

[Genetic control of sex differentiation in humans]

The current literature results on genetic control of sex differentiation and morphogenesis of the human reproductive system are reviewed. Several examples of the nosologic forms caused by mutations in the genes analyzed are considered.

[Damaging effect of antibiotics on the structure of synaptonemal complexes of meiotic chromosome of mice]

The structure of synaptonemal complexes (SCs) of chromosomes of mouse primary spermatocytes were studied using electron microscopy on days 1, 10, and 36 after the completion of per os administration of drugs belonging to three groups of antibiotics: tetracyclins, macrolides, and fluoroquinolones. The antibiotics were administered to mice during ten days. At the substages of early and middle pachytene, heteromorphic SC bivalents and fragments of chromosome-core elements were detected in spermatocytes at all times studied after the administration of the antibiotics of three groups. As cells passed through the period from early to middle pachytene, the number of cells containing heteromorphic SC bivalents and the fragments of chromosome cores gradually decreased, which could be an indication of selection of cells with chromosomal aberrations. A high level of associations between the X chromosome and autosome bivalents (including heteromorphic ones) also favors this suggestion. A gradual decrease in the number of chromosomal aberrations was detected, as time elapsed from the completion of antibiotics administration. The study of sperm obtained from epididymises of males did not reveal significant differences in both morphology and motility of sperm between males of the control and experimental groups.

[Pattern of hereditary reproductive disorders]

A comprehensive clinical, endocrinological, and medical genetic studies were made in 678 patients with reproductive disorders and infertility. A schedule was developed to examine the patients with successive current cytological, cytogenetic, molecular cytogenetics and molecular genetic methods. The pattern and proportion of chromosomal and genic abnormalities were defined among the total number of patients with reproductive disorders.

[Spermatogenesis in rats given potable sulfated mineral water in the early postradiation period]

Rat experiments have shown that course intake (21 days) of sulphate sodium-magnesium-calcium water with sulphate concentration 2.6 mg/l and mineralization 3.1 g/l in early postradiation period (1-2 Gy) inhibits development of dystrophic and destructive processes in spermatogenic epithelium of the testes and maintains spermatogenesis at higher level than control.

[The effect of antenatal nicotine exposure on the male germ cells in Wistar rats]

Chemically pure nicotine in dose 0.4, 1.5 and 5.0 mg/kg bw were percutaneously injected into Wistar rats during 1-20 (I) and 1-8 days (II) of pregnancy. The gametotoxic effect of nicotine in two-month males from offspring of the first generation (F1) was observed in disturbance of differentiation dynamics of spermatocytes at the stage of preleptotene and spermatids of the seventh developmental stage. The suggested quantitative analysis of disturbance in the behaviour of the meiotic chromosomes in metaphase I and II and anatelophase I and II has revealed that nicotine introduction in the period of isolation and migration of the primary sex cells into embryo gonads (2nd series) induces an increase in the level of pathological maturation divisions in the male offspring.